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Sharing of a global navigation satellite system antenna with multiple global navigation satellite system receivers

a global navigation satellite and receiver technology, applied in satellite radio beaconing, measurement devices, instruments, etc., can solve the problems of large loss of transmitted gnss signal strength, significant increase in installation cost, and increase in complexity of assembly of gnss antenna parts

Active Publication Date: 2020-07-28
ACCORD SOFTWARE & SYST PVT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The system enables efficient sharing of a single GNSS antenna among multiple receivers with minimal signal loss and uninterrupted power, reducing installation costs and complexity while ensuring reliable operation and fault detection.

Problems solved by technology

The longer the cable, the larger is the loss in the strength of the transmitted GNSS signal.
Addition of the additional GNSS receiver requires an installer to drill holes on a vehicle surface to install an additional GNSS antenna, which significantly increases the cost of installation.
As the number of parts of the active GNSS antennas, that is, the existing GNSS antenna and the additional GNSS antenna, installed on the vehicle increases, complexity in assembly of the parts of the GNSS antennas increases and results in additional weight of the setup of the additional GNSS antenna and significant costs for installation of the additional GNSS antenna.
Long coaxial cable runs between the additional GNSS antenna and the additional GNSS receiver further increase the costs.
Insertion of the RF splitter in a cable run between the GNSS receivers results in insertion losses and also division of power of the received GNSS signal.
Ohmic losses in the additional circuitry will introduce an additional voltage drop in the DC voltage.
There is a significant voltage drop throughout the long cable.
In each global navigation satellite system (GNSS), errors are inherent.
If the errors are not corrected, the GNSS receivers may provide poor performance and unreliable output.
The sources of errors in the GNSS comprise, for example, the positioning and clock of the satellites, navigation messages transmitted by each satellite, faults in the GNSS antenna, faults in the long run of the cables, noise in the design of the GNSS receivers, etc.

Method used

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  • Sharing of a global navigation satellite system antenna with multiple global navigation satellite system receivers
  • Sharing of a global navigation satellite system antenna with multiple global navigation satellite system receivers
  • Sharing of a global navigation satellite system antenna with multiple global navigation satellite system receivers

Examples

Experimental program
Comparison scheme
Effect test

case 1

[0032] The system noise figure (NF) of a standard global navigation satellite system (GNSS) receiver (not shown) with an active GNSS antenna (not shown) and without an antenna sharing subsystem as implemented in the GNSS antenna sharing receiver 105, is calculated as follows:

Gain of a preamplifier in the active GNSS antenna, G1=398.1 (26 dB)

Noise factor of the preamplifier in the active GNSS antenna, F1=2.51 (4 dB)

Cable loss, G2=0.1 (−10 dB)

Noise factor of the cable that connects the active GNSS antenna to the standard GNSS receiver, F2=10 (10 dB)

Cascaded system noise figure, NF=4.03 dB

case 2

[0033] The system noise figure (NF) of the global navigation satellite system (GNSS) antenna sharing receiver 105 connected to the active GNSS antenna 103 exemplarily illustrated in FIGS. 1-2, is calculated as follows:

Gain of a preamplifier in the active GNSS antenna 103, G1=398.1 (26 dB)

Noise factor of the preamplifier in the active GNSS antenna 103, F1=2.51 (4 dB)

Cable loss+Coupled path loss, G2=−10 dB−6 dB=−16 dB=0.0251

Noise factor of the radio frequency (RF) cable 104+the coupler 111, F2=39.8 (16 dB)

Gain of the low noise amplifier 113, G3=100 (20 dB)

Noise factor of the low noise amplifier 113, F3=1.122 (0.5 dB)

Cascaded system noise figure, NF=4.17 dB

case 3

[0034] The system noise figure of the secondary global navigation satellite system (GNSS) receiver 101 connected to the active GNSS antenna 103 via the GNSS antenna sharing receiver 105 of the cascaded radio frequency (RF) communication system 100 exemplarily illustrated in FIGS. 1-2, is calculated as follows:

Gain of the preamplifier in the active GNSS antenna 103, G1=398.1 (26 dB)

Noise factor of the preamplifier in the GNSS antenna 103, F1=2.51 (4 dB)

Cable loss+insertion loss due to the coupler 111, G2=−10 dB−0.5 dB=−10.5 dB=0.0316

Noise factor of the RF cable 104+the coupler 111, F2=31.6 (10.5 dB)

Cascaded system noise figure NF=4.04 dB

[0035]As exemplarily illustrated in Table 1 below, the noise figure of the RF front end section of the global navigation satellite system (GNSS) antenna sharing receiver 105 comprising the coupler 111 is 1 dB, while the noise figure of a GNSS receiver with a splitter is 3.5 dB. That is, the received GNSS signal is degraded by 3.5 dB in the GNSS receiv...

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Abstract

A global navigation satellite system (GNSS) antenna sharing receiver (GNSSASR) for sharing a GNSS antenna with one or more secondary GNSS receivers is provided. The GNSSASR includes an input radio frequency (RF) port for receiving a GNSS signal from the GNSS antenna, one or more output RF ports for transmitting the GNSS signal to the secondary GNSS receivers, a coupler for reducing attenuation in the GNSS signal transmitted to the secondary GNSS receivers, a power supply circuit for supplying a direct current (DC) voltage with reduced loss to the GNSS antenna based on availability of a secondary GNSS receiver, and a current monitoring circuit for monitoring DC flow to the GNSS antenna from the power supply circuit, limiting an increase in the DC flow due to a fault in the GNSS antenna, and indicating a fault in the GNSS antenna to the GNSSASR and the secondary GNSS receivers.

Description

BACKGROUND[0001]A global navigation satellite system (GNSS) is a satellite navigation system with global coverage and comprises the global positioning system (GPS), the Globalnaya Navigatsionnaya Sputnikovaya Sistema (GLONASS), the BeiDou navigation satellite system, Galileo, the independent regional navigation satellite system (IRNSS), and the quasi-zenith satellite system (QZSS). The GNSS is typically used for navigation on land, sea, and air. A vehicle, for example, an aircraft, a helicopter, a ship, a truck, etc., may have a navigation sensor with an inbuilt GNSS receiver on board with a standard GNSS antenna and cable assembly. The GNSS receiver comprises a radio frequency port that connects the GNSS receiver to the GNSS antenna via the cable assembly. The GNSS receiver processes GNSS signals transmitted by satellites, and determines position and velocity of the vehicle, and precise time. The GNSS signals transmitted by the satellites are weak radio frequency (RF) signals. Sinc...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G01S19/36G01S19/37G01S19/14G01S19/33
CPCG01S19/36G01S19/37G01S19/33G01S19/14
Inventor SHETTY, SHAMANTHNAYAK, RAKESH AMMUNJEKV, MAHESH KUMARSHENOY, RAGHAVENDRA MANUR
Owner ACCORD SOFTWARE & SYST PVT